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objtool/klp: Fix cloning of zero-length section symbols

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Fix NULL dereference when cloning a symbol from an empty section.
sec->data is only populated for sections with non-zero size.

Fixes: dd590d4d57 ("objtool/klp: Introduce klp diff subcommand for diffing object files")
Acked-by: Song Liu <song@kernel.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
This commit is contained in:
Josh Poimboeuf 2026-04-09 18:35:01 -07:00
parent c4c02d4450
commit 98377f3ba7
1 changed files with 1 additions and 1 deletions
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tools/objtool/klp-diff.c
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@ -681,7 +681,7 @@ static struct symbol *__clone_symbol(struct elf *elf, struct symbol *patched_sym
size_t size;
/* bss doesn't have data */
if (patched_sym->sec->data->d_buf)
if (patched_sym->sec->data && patched_sym->sec->data->d_buf)
data = patched_sym->sec->data->d_buf + patched_sym->offset;
if (is_sec_sym(patched_sym))